초록

Antenna arrays with space-time adaptive processing (STAP) have been widely used in Global NavigationSatellite System (GNSS) to suppress interference in spatial domain as well as temporal domain, itsperformance depends on digital beamforming algorithms. In this paper, we propose a joint adaptivebeamforming algorithm which produces nullings in the directions of interference while simultaneouslymaximizing carrier-to-noise ratio (C/N0) of post-correlation signal. Firstly, the interferences arecancelled by using subspace orthogonal projection. Then the maximum C/N0 constraint algorithm isemployed to enhance the post-correlation signal. Meanwhile, a simple estimation approach aboutnumbers of interferences is introduced. Finally, simulations demonstrate that using our adaptivealgorithm, STAP can effectively suppress the strong interference and improve the capturing capability ofGNSS.